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f2fs: implement a lock-free stat_show

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The stat_show is just to show the current status of f2fs.
So, we can remove all the there-in locks.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2014-02-24 13:00:13 +09:00
parent 8a7ed66aaf
commit 8b8343fa9d
3 changed files with 6 additions and 42 deletions
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3
fs/f2fs/debug.c
View File

@ -86,7 +86,6 @@ static void update_sit_info(struct f2fs_sb_info *sbi)
{
struct f2fs_stat_info *si = F2FS_STAT(sbi);
unsigned int blks_per_sec, hblks_per_sec, total_vblocks, bimodal, dist;
struct sit_info *sit_i = SIT_I(sbi);
unsigned int segno, vblocks;
int ndirty = 0;
@ -94,7 +93,6 @@ static void update_sit_info(struct f2fs_sb_info *sbi)
total_vblocks = 0;
blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
hblks_per_sec = blks_per_sec / 2;
mutex_lock(&sit_i->sentry_lock);
for (segno = 0; segno < TOTAL_SEGS(sbi); segno += sbi->segs_per_sec) {
vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
dist = abs(vblocks - hblks_per_sec);
@ -105,7 +103,6 @@ static void update_sit_info(struct f2fs_sb_info *sbi)
ndirty++;
}
}
mutex_unlock(&sit_i->sentry_lock);
dist = TOTAL_SECS(sbi) * hblks_per_sec * hblks_per_sec / 100;
si->bimodal = bimodal / dist;
if (si->dirty_count)

18
fs/f2fs/f2fs.h
View File

@ -704,11 +704,7 @@ static inline int get_blocktype_secs(struct f2fs_sb_info *sbi, int block_type)
static inline block_t valid_user_blocks(struct f2fs_sb_info *sbi)
{
block_t ret;
spin_lock(&sbi->stat_lock);
ret = sbi->total_valid_block_count;
spin_unlock(&sbi->stat_lock);
return ret;
return sbi->total_valid_block_count;
}
static inline unsigned long __bitmap_size(struct f2fs_sb_info *sbi, int flag)
@ -804,11 +800,7 @@ static inline void dec_valid_node_count(struct f2fs_sb_info *sbi,
static inline unsigned int valid_node_count(struct f2fs_sb_info *sbi)
{
unsigned int ret;
spin_lock(&sbi->stat_lock);
ret = sbi->total_valid_node_count;
spin_unlock(&sbi->stat_lock);
return ret;
return sbi->total_valid_node_count;
}
static inline void inc_valid_inode_count(struct f2fs_sb_info *sbi)
@ -829,11 +821,7 @@ static inline void dec_valid_inode_count(struct f2fs_sb_info *sbi)
static inline unsigned int valid_inode_count(struct f2fs_sb_info *sbi)
{
unsigned int ret;
spin_lock(&sbi->stat_lock);
ret = sbi->total_valid_inode_count;
spin_unlock(&sbi->stat_lock);
return ret;
return sbi->total_valid_inode_count;
}
static inline void f2fs_put_page(struct page *page, int unlock)

27
fs/f2fs/segment.h
View File

@ -380,26 +380,12 @@ static inline void get_sit_bitmap(struct f2fs_sb_info *sbi,
static inline block_t written_block_count(struct f2fs_sb_info *sbi)
{
struct sit_info *sit_i = SIT_I(sbi);
block_t vblocks;
mutex_lock(&sit_i->sentry_lock);
vblocks = sit_i->written_valid_blocks;
mutex_unlock(&sit_i->sentry_lock);
return vblocks;
return SIT_I(sbi)->written_valid_blocks;
}
static inline unsigned int free_segments(struct f2fs_sb_info *sbi)
{
struct free_segmap_info *free_i = FREE_I(sbi);
unsigned int free_segs;
read_lock(&free_i->segmap_lock);
free_segs = free_i->free_segments;
read_unlock(&free_i->segmap_lock);
return free_segs;
return FREE_I(sbi)->free_segments;
}
static inline int reserved_segments(struct f2fs_sb_info *sbi)
@ -409,14 +395,7 @@ static inline int reserved_segments(struct f2fs_sb_info *sbi)
static inline unsigned int free_sections(struct f2fs_sb_info *sbi)
{
struct free_segmap_info *free_i = FREE_I(sbi);
unsigned int free_secs;
read_lock(&free_i->segmap_lock);
free_secs = free_i->free_sections;
read_unlock(&free_i->segmap_lock);
return free_secs;
return FREE_I(sbi)->free_sections;
}
static inline unsigned int prefree_segments(struct f2fs_sb_info *sbi)